A brief halt to shipping after the terrorist attacks appears to have lowered whales’ stress levels, an ocean experiment suggests.

Salmon populations in California’s Mokelumne watershed are on the rise, but it turns out that only 4 percent are of wild origins.

Salmon populations in California’s Mokelumne watershed are on the rise, but it turns out that only 4 percent are of wild origins.

Researchers calculate that from 2003 to 2010, the world’s glaciers and ice caps lost about 150 billion tons of ice each year.

Researchers calculate that from 2003 to 2010, the world’s glaciers and ice caps lost about 150 billion tons of ice each year.

For protection, mammals generally rely on teeth, claws, muscles, keen senses or quick wits. Every so often, however, a mammalian lineage discovers the wonders of chemistry.

An online presentation takes readers through what scientists can and cannot conclude about the relationship between recent climate extremes and global warming.

An online presentation takes readers through what scientists can and cannot conclude about the relationship between recent climate extremes and global warming.

No explanation has emerged for the unusually high number of dolphins landing on Cape Cod beaches.

Rising human consumption of marine mammals in tropical regions poses a threat to animals like the dugong, which is similar to a manatee, and the Atlantic humpback dolphin, researchers write.